56 STALK-EYED CRUSTACEA. 
dinal line on the middle of the dorsal side. Ophthalmic scales long, pointed, 
grooved on the dorsal side. Antennular and antennal peduncles not much 
longer than the eye-stalk. Second segment of antenna produced on the 
outer side into an acute process which reaches about one third of the way to 
the tip of the antennal acicle ; there is also a minute acute tooth at the inner 
distal angle of this segment of the antenna. he acicle is somewhat shorter 
than the eye-stalk. 
Chelipeds very unequal in size. Right cheliped reaching forward about 
the same distance as the ambulatory legs. The merus of this appendage 
reaches but little beyond the eye; it is trigonal, the surface for the most 
part smooth and naked, the upper margin obtuse and unarmed, the distal 
dorsal border armed with three small acute teeth; the lower face of the 
merus is somewhat hollowed out and the antero-lateral margins on either 
side of the articulating membrane between this segment and the carpus are 
cristate and denticulate. The carpus widens from the proximal to the distal 
end where the width exceeds the length of the segment; its upper surface 
is convex, naked, rather sparsely ornamented with very minute tubercles 
visible under a lens, its inner margin armed with about nine coarse blunt 
teeth (alternately larger and smaller), its outer margin clearly defined by a 
low, obscurely toothed ridge. The hand is very broad, its upper face convex 
in both directions, and set with minute rounded tubercles which increase in 
size on the distal part of the segment, especially on the immovable finger ; 
the inner border produced into bluntly toothed crest which projects far be- 
yond the corresponding border of the dactylus ; the outer margin is defined 
by a crenate rim; the lower face is beset with low, inconspicuous, granular 
tubercles. The outer margin of the dactylus is cut into rounded teeth, and 
a conspicuous blunt-toothed ridge runs the length of the upper face; the sur- 
face between this ridge and the outer edge is deeply concave; the prehensile 
edges of both fingers are armed with coarse calcareous teeth, 
The left cheliped is very small and slender, reaching only to the distal 
end of the carpus of the left ambulatory appendages. The merus is laterally 
compressed ; its upper margin is rounded, the lower external margin is 
spinulose at the distal end, near the articulation with the carpus. The upper 
side of the carpus is concave and bordered on each side with a row of spines; 
there is a sharp tooth at the distal end of the external inferior margin. The 
chela is longer than the carpus, with fingers longer than the palm ; the dorsal 
face of the hand is convex, rising into an obscurely tuberculated ridge which 
